<!-- 这是侧边导航组件 -->
<template>
  <div>
    <el-menu
      class="el-menu-vertical-demo"
      :collapse="isCollapse"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b"
    >
    <h3 v-show="!isCollapse" style="color: #fff">通用后台管理系统</h3>
    <h3 v-show="isCollapse" style="color: #fff">后台</h3>
      <!-- 菜单 -->
      <el-menu-item :index="item.path" v-for="item in noChildren" :key="item.path" @click="clickMenu(item)">
        <i :class="'el-icon-'+item.icon"></i>
        <span slot="title">{{item.label}}</span>
      </el-menu-item>
      <!-- 分级菜单 -->
      <el-submenu index="item.label" v-for="item in hasChildren" :key="item.path">
        <template slot="title">
          <i :class="'el-icon-'+item.icon"></i>
          <span slot="title">{{item.label}}</span>
        </template>
        <el-menu-item-group>
          <el-menu-item :index="subItem.path" v-for="(subItem, subIndex) in item.children" :key="subIndex" @click="clickMenu(item)">
            <i :class="'el-icon-'+subItem.icon"></i>
            <span slot="title">{{subItem.label}}</span>
          </el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </el-menu>
  </div>
</template>

<script>
export default {
  data () {
    return {
      menu: [
        {
          path: "/",
          name: "home",
          label: "首页",
          icon: "s-home",
          url: "Home/Home"
        },
        {
          path: "/mall",
          name: "mall",
          label: "商品管理",
          icon: "goods",
          url: "MallManage/MallManage"
        },
        {
          path: "/user",
          name: "user",
          label: "用户管理",
          icon: "user",
          url: "UserManafe/UserManafe"
        },
        {
          label: "其它",
          icon: "location",
          children: [
            {
              path: "/page1",
              name: "page1",
              label: "页面1",
              icon: "setting",
              url: "Other/PageOne"
            },
            {
              path: "/page2",
              name: "page2",
              label: "页面2",
              icon: "setting",
              url: "Other/PageTwo"
            },
          ]
        }
      ],
    };
  },
  methods: {
    clickMenu (item) {
      this.$router.push({ name: item.name })
      this.$store.commit("SELECTMENU", item)
    }
  },
  computed: {
    noChildren () {
      return this.menu.filter((item) => !item.children)
    },
    hasChildren () {
      return this.menu.filter((item) => item.children)
    },
    isCollapse () {
      return this.$store.state.tab.isCollapse
    },
  }
}
</script>

<style scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
    height: 100vh;
    border: none;
  }
  .el-menu-item, .el-submenu{
    text-align: left;
  }
</style>
